Improvement in carpenters  bevels



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Carpenters Bevels.

No. 136,714. Patentewmarh11,1873.

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HENRY FAiRBANKs AND IsAIAH VJ. ROBINSON, OF sT. JO'HNsBURY, vtr.

IMPROVEMENT IN CARPENTERS BEvELs.

Specification forming part of Letters PatentNo. 136,714, dated March 1l, 1873.

To all whom it may concern.'

Be it known that we, HENRY FAIRBANKs and ISAIAH J. ROBINSON, 0f St. Johnsbury, in the county of Caledonia and State of Verl mont, have invented a new Improvement in .Bevel-Squares; and we do hereby declare the following, when taken in connection with the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes part of this specilication, and represents, in

Figure l, a side view; Fig. 2, an edge view 5 Fig. 3, a side View illustrating the Operation; Fig. 4, an inside view of one of the parts of the handle; and in Fig. 5, a longitudinal central section through the handle, illustrating the blades as turned at right angles. -I This invention relates to an improvement in what are commonly termed bevel-squares, the object being chieiiy to produce an instrument with two tongues, one of which may be set at right angles, while the other may be turned to anydesired angle 5 and it consists in combining in a single handle two adjustable and independent tongues, one of which may be set at right angles While the other is free to be turned to any desired angle. Y

A is the handle, usually formed in two parts, A and A', the slit a between the two being formed to receive the two blades B C, which, by preference, are made alike, and slitted for adjustment, and made adjustable around\a pivot, d. One ofthe blades here represented, as B, is provided with means for being set at right or otherdetined angles; and this is here done by a plate, D, arranged within the portion A of the handle, as seen in Figs. 4 and 5, which said plate is elastic, so that when free it will set into a recess, the handle, as in Fig. et,'leaving the slit clear,` so that both blades, or'eitherof them, may be freely turned. When the blade B is set at right angles the blade D is depressed by a projection, b, extending through the side, its end `being formed so as to set hard against the blade B, as seen in Fig. 5, and hold it firmly at right angles to the handle. This plate D is locked in such position by a slide, F, operated through a slot in the handle, as seen in Fig. 5 5 and when it is desired t-o release the said angular blade, withdraw the slide, and the plate D springs away into the handle, leaving it free, as before described.

It will be readily seen that if other than a right angle is required for the blade the end of the plate D must be formed at that angle, the adjustment of that blade being predetermined, and not variable. While one blade is thus locked in an angular position the other is left free to be turned to any angle and be there set. The advantage of thus combining two instruments in one will be too apparent to require mention here. When the other blade has been set to the-required angle, then a slide or bar, Il, (see Fig. 5,) having its end inclined, is forced beneath a correspondingly -inclined washer, l, at the pivot, by means of a set-screw, P, or otherwise, in substantially the same manner as in a patent granted to Isaiah J. Robinson, June 14, 1870, one of the applicants for this invention, with this difference, that in that patent the incline upon which the slide rises is formed in the handle, the slide bearing and moving directly on the surface of the blade, which is prevented by the introductionof` the inclined washer l and the slide, making the bearing or force by which the blade is secured more direct than in that patent.

This device will hold both blades when properly adjusted. It is therefore not essential that the plate D should remain against the blade B any longer than to set the blade. The slide F, therefore, is not essential when there is other setting device, but is desirable.

We claim as our invention 1. Thetwo blades B U, arranged in the same slit in the handle, and provided with means for clamping both, combined with the plate D acting as an independent clamp for one blade, the whole constructed and operating substantially as specified.

2. In a bevel-square, the arrangement of the elastic plate D in the handle, the said plate rigidly attached to the handle at its lower end, its upper end so as to be set down to hold the blade of the square at the tion to hold the blade B, substantially as'set vangle'deined by the 'end of the said plate, forth. or returned into the handle to leave the blade HENRY FAIRBANKS. free for adjustment to other angles. substan- ISAIAH J. ROBINSON. tially in the manner described.

3. In combination with the subject-matter Vitnesses: of the second clause of claim, the slide F or N. M. JOHNSON, equivalent for setting` the plate D in a posi- D. M. LIVINGSTON. 

